In 1910, forest fires swept through parts of Idaho, Montana, and Washington, killing at least 85 people and burning 3 million acres.

In 1940, during World War II, British Prime Minister Winston Churchill paid tribute to the Royal Air Force before the House of Commons, saying, ‘‘Never in the field of human conflict was so much owed by so many to so few.’’

In 1953, the Soviet Union publicly acknowledged it had tested a hydrogen bomb.

In 1968, the Soviet Union and other Warsaw Pact nations began invading Czechoslovakia to crush the ‘‘Prague Spring’’ liberalization drive.

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In 1972, the Wattstax concert took place at the Los Angeles Memorial Coliseum.